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Topic Area: Physics

Displaying records 21 to 30 of 596 records.
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21. A new algorithm for clock weights for the SIM time scale
Topic: Physics
Published: 5/24/2012
Authors: Michael A Lombardi, J. Mauricio Lopez-Romero, Nelida Diaz-Munoz, E. de Carlos-Lopez
Abstract: A time and frequency comparison system has been developed for the Sistema Interamericano de Metrologia (SIM) region in order to compare in real time the time references maintained at the SIM national metrology institutes (NMIs). Since January 2010 a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911482

22. Blackbody effects in the Yb optical lattice clock
Topic: Physics
Published: 5/24/2012
Authors: Andrew D Ludlow, Jeffrey Aaron Sherman, Nathan D. Lemke, Kyle Patrick Beloy, Nathan Morris Bjork Hinkley, M. Pizzocaro, Richard W Fox, Christopher W Oates
Abstract: We report a high accuracy measurement of the differential static polarizability for the clock transition in a Yb lattice clock, a key parameter for determining the blackbody BBR) shift of this transition. We further report efforts to determine the 6s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911630

23. Common-Arm Counter Propagating Phase Bridge for Vibration Sensitivity Measurement
Topic: Physics
Published: 5/24/2012
Authors: Danielle Grace Lirette, Corey Andrew Barnes, Archita Hati, Jason Anthony DeSalvo, Craig W Nelson, David Allan Howe
Abstract: Current methods for measuring the vibration sensitivity of microwave devices are primarily limited by choice of cables connecting a stationary platform to a vibrating actuator. We experimentally compare the current ("conventional") method with a new ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911524

24. Mechanical stabilization of a microrod-resonator optical frequency
Topic: Physics
Published: 5/24/2012
Authors: Scott Brian Papp, Pascal Patrice Del'Haye, Scott A Diddams
Abstract: We present line-spacing frequency control of a microresonator-based optical frequency comb by way of mechanical actuation. Using this novel technique we have achieved a record level of residual stability in the line spacing of 5 {multiply} 10^u-15^ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911631

25. PM-AM Correlation Measurements and Analysis
Topic: Physics
Published: 5/24/2012
Authors: David Allan Howe, Archita Hati, Craig W Nelson, Danielle Grace Lirette
Abstract: We measure and analyze effects of nonlinear mixing of phase-noise modulation (PM) and amplitude-noise modulation (AM) in an oscillating signal by real-time correlations measured in the cross power spectral density (CPSD). We outline sensitive measur ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911532

26. Phase-Noise Measurement of a 670 GHz Source
Topic: Physics
Published: 5/24/2012
Authors: Jason Anthony DeSalvo, Archita Hati, Craig W Nelson, David Allan Howe
Abstract: We present phase-noise measurements in support of terahertz electronics. Using digital phase-noise measurement techniques and an even-harmonic mixer, we achieve a phase-noise measurement system in waveguide (WR1.5). At 670 GHz an upper bound of thi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911527

27. Ultra-low-noise Regenerative Frequency Divider for High Spectral Purity RF Signal Generation
Topic: Physics
Published: 5/24/2012
Authors: Archita Hati, Craig W Nelson, Corey Andrew Barnes, Danielle Grace Lirette, Jason Anthony DeSalvo, Tara Michele Fortier, Franklyn J Quinlan, Andrew D Ludlow, Till P Rosenband, Scott A Diddams, David Allan Howe
Abstract: We implement an ultra-low-noise frequency divider chain from 8 GHz to 5 MHz that utilizes custom-built regenerative frequency divide-by-2 circuits. The single-sideband (SSB) residual phase noise of this regenerative divider at 5 MHz output is -163 dB ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911522

28. Vibrational analysis of stabilized lasers
Topic: Physics
Published: 5/24/2012
Authors: Kenneth Jeramiah Hughes, Archita Hati, Craig W Nelson, David Allan Howe
Abstract: Frequency-stabilized lasers are routinely used in a variety of research and application areas relating to laser-cooled atoms. Important applications in the cold-atom regime include atomic time keeping, inertial navigation, gravitational sensing, and ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911603

29. High-power, hybrid Er:fiber/Tm:fiber frequency comb source in the 2 {mu}m wavelength region
Topic: Physics
Published: 5/1/2012
Authors: Florian B. (Florian) Adler, Scott A Diddams
Abstract: We present a 2-{mu}m frequency comb based on a reliable mode-locked Er:fiber laser with 100 MHz repetition rate. After shifting the spectrum of the amplified Er:fiber comb to longer wavelengths, a single-clad Tm/Ho:fiber is used as a self-pumped pre- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910655

30. Engineered two-dimensional Ising interactions on a trapped-ion quantum simulator with hundreds of spins
Topic: Physics
Published: 4/26/2012
Authors: Joseph Wright Britton, Brian C Sawyer, Adam Keith, C.-C. Joseph Wang, James K. Freericks, Hermann Uys, Michael Biercuk, John J Bollinger
Abstract: The presence of long-range quantum spin correlations underlies a variety of physical phenomena in condensed matter systems, potentially including high-temperature superconductivity, making this a fertile area for exploration. Unfortunately, many prop ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910061